I am trying to create a mesh for a volume with a curved surface. I amhaving the following geometry which I created via rotating 3-point arc by180 deg (so basically I am having 1 complete cylinder + a spherical capwhich is a small part of a sphere + rest of the body)

[image: Inline image 1]I created this geometry by rotating the following by 180 deg about its axis-

Do we have a control over the orientation of tetrahedral mesh elementscreated by GID. As I see, GID creates a specific orientation of thetetrahedral elements by default. ( Referring to structured mesh only)For example, GID creates the following mesh when I mesh it with tetrahedralelements.

[image: Inline image 1]

As we can see, the orientation of elements changes around the mid-plane ofthe geometry. Is there a way to change this orientation and have a moreconsistent one like in the figure below-

[image: Inline image 2]

There is one other 'setting' under preferences of structured mesher in GIDwhich doesn't help either.

It is not possible to control the ‘splitting diagonal’ of structured triangles or tetrahedral.

The only think that you can do is to set the flag ‘Symmetrical structured’ for Tetrahedra (in meshing preferences), then an extra node is create in the center of the ‘structured box’ and then the mesh become more symmetrical.

E.g. for example, in case of triangles without and with symmetrical flag:

Do we have a control over the orientation of tetrahedral mesh elements created by GID. As I see, GID creates a specific orientation of the tetrahedral elements by default. ( Referring to structured mesh only)For example, GID creates the following mesh when I mesh it with tetrahedral elements.

Inline image 1

As we can see, the orientation of elements changes around the mid-plane of the geometry. Is there a way to change this orientation and have a more consistent one like in the figure below-

Inline image 2

There is one other 'setting' under preferences of structured mesher in GID which doesn't help either.

Unfortunatelly you cannot control the orientation of the structured tetras. The only option is to set the ‘Symetrical structured’ option in the Preferences-Meshing window, which will lead to a different configuration of tetras which is symmetrical. In the other hand, it produces a higher number of elements.

Do we have a control over the orientation of tetrahedral mesh elements created by GID. As I see, GID creates a specific orientation of the tetrahedral elements by default. ( Referring to structured mesh only)For example, GID creates the following mesh when I mesh it with tetrahedral elements.

Inline image 1

As we can see, the orientation of elements changes around the mid-plane of the geometry. Is there a way to change this orientation and have a more consistent one like in the figure below-

Inline image 2

There is one other 'setting' under preferences of structured mesher in GID which doesn't help either.

I was just wondering why GID prefers one diagonal over the other for someelement and the other oriented diagonal for some other element, is thisrule arbitrary or is there abuilt in predictive algorithm?

It is not possible to control the ‘splitting diagonal’ of structured triangles or tetrahedral.

The only think that you can do is to set the flag ‘Symmetrical structured’ for Tetrahedra (in meshing preferences), then an extra node is create in the center of the ‘structured box’ and then the mesh become more symmetrical.

E.g. for example, in case of triangles without and with symmetrical flag:

Do we have a control over the orientation of tetrahedral mesh elements created by GID. As I see, GID creates a specific orientation of the tetrahedral elements by default. ( Referring to structured mesh only) For example, GID creates the following mesh when I mesh it with tetrahedral elements.

[image: Inline image 1]

As we can see, the orientation of elements changes around the mid-plane of the geometry. Is there a way to change this orientation and have a more consistent one like in the figure below-

[image: Inline image 2]

There is one other 'setting' under preferences of structured mesher in GID which doesn't help either.

I was just wondering why GID prefers one diagonal over the other for some element and the other oriented diagonal for some other element, is this rule arbitrary or is there a built in predictive algorithm?

It is not possible to control the ‘splitting diagonal’ of structured triangles or tetrahedral.

The only think that you can do is to set the flag ‘Symmetrical structured’ for Tetrahedra (in meshing preferences), then an extra node is create in the center of the ‘structured box’ and then the mesh become more symmetrical.

E.g. for example, in case of triangles without and with symmetrical flag:

Do we have a control over the orientation of tetrahedral mesh elements created by GID. As I see, GID creates a specific orientation of the tetrahedral elements by default. ( Referring to structured mesh only)For example, GID creates the following mesh when I mesh it with tetrahedral elements.

Inline image 1

As we can see, the orientation of elements changes around the mid-plane of the geometry. Is there a way to change this orientation and have a more consistent one like in the figure below-

Inline image 2

There is one other 'setting' under preferences of structured mesher in GID which doesn't help either.